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Old 06-03-2013, 10:57 AM   #1
Borski
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Intermittent Engine Power Reduction

Hey guys!

Let me know if this is the wrong spot for this post.

I was driving my 2012 home from work on the highway when I noticed a decrease in engine power, I wasn't able to accelerate on the highway (going 70). I got off the exit for my house, and went to accelerate on to the road and noticed it was insanely sluggish. It felt like the car was running at half power. I turned off the AC just to verify. This continued on the local roads all the way home. I parked the car, and then attempted to "rev up" the engine with the car in neutral. I noticed it was still very sluggish to accelerate even without load on the engine. Pedal to the floor, it probably took 10 seconds to hit 4k RPM, in netural.

I turned off the car to go inside and get my tools out to check what I initially suspected could have been a spark plug issue. I restarted the car, just to ensure that I could recreate the problem, and the car runs fine. It's been a week now - car still running fine.

What could have been the root cause of this?

Details of Car:
-2012 SE
-42k miles
-Manual Transmission
-Up to date on all maintenance and oil change
-No previous engine or electrical problems


Thanks guys!


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Old 06-03-2013, 11:10 AM   #2
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Check your coolant first of all then report back. Others can chime in.

There are many things that could cause this, but the ECU is programmed with a limp home mode in case the engine exceeds safe normal operating temperature.

Not saying this is the cause, just one of the possible ones.
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Old 06-03-2013, 11:27 AM   #3
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I had that too after driving relatively hard, took like 15 minutes to restore
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Old 06-03-2013, 01:34 PM   #4
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I know this doesn't help but I figure I should mention my "problem" I had.. Driving down the highway about 110km/hr (~70mph) and the car wouldn't accelerate over 2000rpm. Car started to slow down and I managed to cut over onto the shoulder. Turned the car off and back on and it went fine after that. Hasn't happened since and I didn't get any errors/warnings during or after.

One downside to having your car riddled with electronics.
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Old 06-03-2013, 03:45 PM   #5
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This sounds interesting since it is happening to a few people. Get or borrow an OBD2 code scanner and see what it gives you. Places like Advance Auto Parts will run your codes for free.
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Old 06-03-2013, 03:46 PM   #6
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This sounds similar to the issue some people are reporting with the EcoBoost F-150 and SHO Taurus.
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Old 06-03-2013, 04:37 PM   #7
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Interesting. I suspect it was an accidental "limp home" mode then.

I wasn't driving hard, if was about 90F out. There were no temperature exceedences.

Just checked the coolant, everything is perfectly normal.

Sounds like an error with a sensor or something triggered "limp home" in the engine.

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Old 06-04-2013, 09:18 AM   #8
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Quote:
Originally Posted by Borski View Post
Interesting. I suspect it was an accidental "limp home" mode then.

I wasn't driving hard, if was about 90F out. There were no temperature exceedences.

Just checked the coolant, everything is perfectly normal.

Sounds like an error with a sensor or something triggered "limp home" in the engine.

Sent from my HTC One X using FF Mobile
I think the same happened with me. I keep my ODB reader in my car and I plugged it in when was safe to do so and I had no codes at all given. Has not happened ever since... x-files weird!
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Old 06-11-2013, 03:56 PM   #9
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my 2013 Ford Focus Hatch SE did this a couple of times but when it was happening my temp was normal and no engine light. What i did notice is that the ambient temp outside both times was over 95o so what I was thinking is my injen cold air was no longer cold air and with outside temps being almost 100o it must have been over 130o under the hood because when the car cooled down and I drove it when it was cooler the car drove perfect. Just my experiance
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Old 06-20-2013, 01:49 PM   #10
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I also had this happen to me but it was not hot outside ~20 deg C. Would would rev super slow.

-2012 SE HB
-30000 km
-Manual trans
-No mods
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